Heating oven for realizing asphalt oxidation
By using an array of windshields in the heating oven to evenly disperse the hot air, the problem of uneven asphalt oxidation is solved, the performance consistency of hard carbon is improved and the cost is reduced, making it suitable for the industrial production of hard carbon.
Patent Information
- Application Number
- CN202422646006.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Existing asphalt oxidation devices are unable to achieve sufficient contact and complete oxidation of asphalt with air or oxygen, resulting in poor consistency in the performance of the final prepared hard carbon.
A heating oven is designed that uses an array of windshields to evenly disperse hot air, allowing the hot air to completely react with the asphalt on the partitions, and uses air or oxygen for oxidative cross-linking, avoiding the addition of additional oxidants and ensuring oxidation uniformity.
The results show that the consistency of hard carbon performance is improved, the production cost is reduced, and there is better potential for industrial mass production.
Smart Images
Figure CN223422627U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of asphalt oxidation equipment, and more specifically, relates to a heating oven for achieving asphalt oxidation. Background Art
[0002] Hard carbon is a type of amorphous carbon that is difficult to graphitize even at temperatures above 2500°C. It has a highly amorphous structure with short-range graphitization. Compared with the graphite structure, the interlayer distance (0.37-0.42nm) of hard carbon is relatively large, and it has abundant voids or pores and defects, making it more suitable as a negative electrode material for sodium-ion batteries.
[0003] The precursor materials of hard carbon negative electrode materials for sodium ion batteries are mainly divided into four types: biomass precursors, sugar precursors, synthetic resin precursors, and asphalt precursors. Among them, asphalt-based precursors have the advantages of low cost, high carbon content, and high carbon yield, and are considered to be potential carbon sources for synthesizing hard carbon negative electrodes. Asphalt is a by-product of the coal or petroleum industry. It is mainly composed of a large number of polycyclic aromatic hydrocarbons (PAHs) and structurally related heterocyclic compounds. It has low price and low ash content. It can be used to form nearly parallel carbon layers during heating to ensure high carbon yield and conductivity. However, direct pyrolysis of asphalt forms a microstructure with small interlayer spacing and high orientation during the uncontrollable liquid phase carbonization process, resulting in poor rate performance of sodium ion batteries. Studies have found that by modifying the asphalt molecules, weakening or destroying the interaction between aromatic hydrocarbons, the graphitization of asphalt can be interfered with, driving the transformation of the microstructure. Oxidative crosslinking is one of the ways to modify asphalt, specifically including oxidation with an oxidant (such as dibenzoyl peroxide, etc.) and oxidative crosslinking by heating in air or oxygen atmosphere.
[0004] Oxidative crosslinking by heating in an air or oxygen atmosphere does not require the use of additional oxidants or other additives, thereby eliminating the introduction of additional impurities and reducing costs, thus offering greater potential for industrial mass production. However, when heating asphalt for oxidative crosslinking in air or oxygen, especially when heating and oxidizing large quantities of asphalt, it is common for portions of the asphalt to not be exposed to air or oxygen, or to be insufficiently exposed. This results in incomplete oxidation of this portion of the asphalt, leading to uneven oxidation of the asphalt. Consequently, the degree of oxidation of oxidized asphalt produced in the same oxidation process can vary, leading to poor performance consistency in the final hard carbon produced, making the hard carbon unusable. Utility Model Content
[0005] In response to the defects or improvement needs of the existing technology, the present application provides a heating oven for achieving asphalt oxidation, aiming to solve the problem that the existing asphalt oxidation device cannot achieve sufficient contact and complete oxidation of asphalt with air or oxygen, resulting in poor consistency in the performance of the final prepared hard carbon.
[0006] The present application provides a heating oven for achieving asphalt oxidation, comprising a box body, a partition and a circular windshield array, wherein a first air inlet is provided on the bottom plate of the box body, and an air outlet is provided on the top plate; the partition is parallel to the bottom plate and located in the middle of the box body; the circular windshield array is located directly above the first air inlet and directly below the partition, and the circular windshield array comprises a plurality of windshields, which are parallel to the bottom plate and spaced apart to form the circular windshield array.
[0007] Compared with the prior art, the above technical solution conceived by the present application enables the hot air that enters the box evenly to be homogenized by the windshield, so that the homogenized hot air reacts completely and fully with the asphalt on the partition to obtain hard carbon with stronger performance consistency.
[0008] Furthermore, the longitudinal section of the windshield is rectangular or trapezoidal.
[0009] Furthermore, when the longitudinal section of the windshield is trapezoidal, the upper bottom surface of the trapezoidal section is located on a side close to the bottom plate.
[0010] Furthermore, the windshield is a curved panel, and the outer convex surface of the curved panel is arranged opposite to the bottom plate of the box.
[0011] Furthermore, the number of the first air inlet holes is the same as that of the wind shield and they correspond one to one.
[0012] Furthermore, the windshield is provided with supporting feet, and the supporting feet are fixed to the bottom plate of the box.
[0013] Furthermore, a second air inlet is provided on the side wall of the box body, and a three-way valve is provided on the second air inlet. The two air inlets of the three-way valve are respectively connected to an air source and a nitrogen source.
[0014] Furthermore, the second air inlet is located below the wind shield.
[0015] Furthermore, the first air inlet is connected to an air compressor, and the air inlet end of the air compressor is connected to an air heating device.
[0016] Furthermore, the windshield is made of ceramic.
[0017] In general, the above technical solutions conceived by this application have the following technical advantages compared with the existing technology:
[0018] 1. The present application sets up windshields arranged in an array in the oven so that the hot air entering from the first air inlet is evenly dispersed by the windshields, so that it can fully contact with the asphalt on the partition above it and completely oxidize and cross-link, so that the oxidation degree of the oxidized asphalt prepared by the same oxidation process in the oven is the same, and the performance consistency of the hard carbon finally prepared is higher.
[0019] 2. Since the oven of the present application only introduces hot air during the oxidation process and does not use additional oxidants or other additives, no additional impurities will be introduced, which can reduce costs and thus has better potential for industrial mass production of hard carbon.
[0020] 3. The windshields provided in this application have various shapes. The windshield array composed of windshields of different shapes has different homogenization capabilities. Windshields with trapezoidal, rectangular or curved longitudinal cross-sections can be selected as needed, which is flexible in application. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a diagram showing the overall structure of a heating oven for asphalt oxidation provided in Example 1 of the present application;
[0022] Figure 2 This is a diagram of the internal structure of the heating oven provided in Example 1 of the present application;
[0023] Figure 3 This is a schematic diagram of the structure of the windshield array of the heating oven provided in Example 1 of the present application;
[0024] Figure 4 This is a schematic diagram of the windshield structure provided in Example 2 of the present application;
[0025] Figure 5 This is a schematic diagram of the longitudinal cross-section of the windshield provided in Example 2 of the present application;
[0026] Figure 6 This is a schematic diagram of the windshield structure provided in Example 3 of the present application;
[0027] Figure 7 This is a schematic diagram of the longitudinal cross-sectional structure of the windshield provided in Example 3 of the present application.
[0028] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:
[0029] 1-box, 11-first air inlet, 12-air outlet, 13-second air inlet, 14-three-way valve, 2-partition, 3-wind shield, 31-support foot, 4-air compressor, 5-air heating device. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0031] Example 1
[0032] like Figure 1-3 As shown, a heating oven for achieving asphalt oxidation provided in this embodiment includes a box body 1, a partition 2 and a circular windshield array, a first air inlet 11 is provided on the bottom plate of the box body 1, and an air outlet 12 is provided on the top plate thereof; the partition 2 is parallel to the bottom plate and is located in the middle of the box body 1; the circular windshield array is located directly above the first air inlet 11 and below the partition 2, so as to uniformize the airflow and make the uniformized airflow rise from the channel between adjacent windshields 3 to the partition and react with the asphalt oxidation on the partition 2; the circular windshield array includes multiple windshields 3, each windshield 3 is parallel to the bottom plate and is arranged at intervals to form a circular windshield array.
[0033] Specifically, the box body 1 is a cube, and a feeding door (not shown in the figure) is opened on one side of the cube box. When the feeding door is opened, the asphalt can be fed into the partition 2 in the box body.
[0034] The aforementioned partition 2 is a porous partition, and hot air can fully react with the asphalt placed on the partition 2 through the circular holes thereon, and the partition 2 is arranged in multiple layers, and each layer of partitions is evenly arranged; in other preferred embodiments, the spacing between adjacent partitions 2 is adjustable, such as symmetrically arranged up and down adjustable support frames on both side walls of the box body, and the partition 2 is mounted on a pair of support frames.
[0035] There are four first air inlet holes 11 mentioned above, which are evenly distributed on the bottom plate of the box body. The air outlet holes 12 on the top of the box body correspond one-to-one to the air inlet holes 11 and are also evenly distributed.
[0036] In this embodiment, the longitudinal section of the wind shield 3 is rectangular, that is, each wind shield 3 is a fan-shaped plate body, and the longitudinal section of the fan-shaped plate body along the radial direction is rectangular.
[0037] Specifically, the four fan-shaped plates are provided with support legs 31 on their lower surfaces, and the support legs 31 are fixedly connected to the bottom plate, such as by bolts, or by providing a holder on the bottom plate of the box body, and fixing the support legs 31 into the corresponding holder to form a Figure 3 The circular array of wind deflectors shown.
[0038] In this embodiment, each sector-shaped plate is located directly above the corresponding first air inlet 11 to evenly disperse each airflow, so that the dispersed airflow gradually rises along the edge of each sector-shaped plate.
[0039] In this embodiment, a second air inlet 13 is provided on the side wall of the housing 1. A three-way valve 14 is installed on this second air inlet 13. The two air inlets of the three-way valve 14 are connected to an air source and a nitrogen source, respectively. During the oxidation process, the valve is opened to admit hot air to participate in the oxidation reaction. The air admitted through the second air inlet 13 combines with the hot air admitted through the first air inlet 11 at the bottom of the housing 1 to form an air circulation system within the housing 1, improving the contact between the asphalt and the air. In the event of overheating or fire within the housing, the nitrogen source (N2) is opened, the air source (O2) is closed, and room-temperature nitrogen is introduced to cool the asphalt or extinguish the fire.
[0040] In this embodiment, the second air inlet 13 is located below the windshield 3 , that is, the hot air introduced through the second air inlet 12 enters between the bottom plate and the windshield 3 from the side, is homogenized by the windshield 3 , and then rises.
[0041] In this embodiment, an air compressor 4 is connected to the first air inlet 11, and an air heater 5 is connected to the air inlet of the air compressor 4 via a pipe. The air heater 5 heats the external air and then feeds it into the air compressor 4. The air compressor 4 is used to supply hot air with a stable flow rate into the housing 1, ensuring that the asphalt and air in the housing 1 undergo a fully and even oxidation reaction.
[0042] In this embodiment, the material of the windshield 2 is ceramic. The windshield made of ceramic can withstand high temperatures and has the advantages of being stable, corrosion-resistant, and easy to maintain.
[0043] Example 2
[0044] The difference between this embodiment and embodiment 1 is that the longitudinal section of the windshield 3 is trapezoidal. Figure 4-5 As shown, the windshield 3 is fan-shaped, but the upper surface of the fan-shaped plate is larger than the lower surface thereof, so that the longitudinal cross-section of the fan-shaped plate along the radial direction is trapezoidal.
[0045] In this embodiment, the trapezoidal shape of the longitudinal section of the windshield 3 is Figure 5 As shown in the isosceles trapezoid, the small upper bottom surface of the isosceles trapezoidal windshield is opposite to the bottom plate of the box body 1, and the large lower bottom surface is opposite to the top plate of the box body 1. In this way, the airflow can be guided to flow upward in a predetermined direction along the inclined surface of the periphery of the windshield 3, thereby controlling the direction of the airflow.
[0046] The upper bottom surface of the trapezoidal windshield is smaller and faces the airflow, which can disperse the airflow, reduce the concentration of the airflow, and reduce the wind speed in the local area. The larger lower bottom surface helps to make the dispersed airflow more uniform.
[0047] Example 3
[0048] The difference between this embodiment and embodiment 2 is that Figure 6-7As shown, the windshield plate 3 is a curved plate with the same curvature degree on the upper and lower surfaces, and the outer convex surface of the curved plate is arranged opposite to the bottom plate of the box body 1.
[0049] Specifically, the upper and lower surfaces of the windshield 3 are fan-shaped, but its longitudinal cross-section is a quadrilateral with a pair of curved upper and lower edges. The center of the curved surface of the curved plate within the housing 1 is located away from the bottom plate of the housing 1. The support legs 31 are located away from the center of the curved surface and are secured to the bottom plate of the housing 1. The convex surface of the curved plate is positioned opposite the bottom plate of the housing 1, allowing the airflow to be dispersed and evened over the convex surface.
[0050] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.
[0051] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0053] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0054] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A heating oven for achieving asphalt oxidation, characterized in that: The invention comprises a box body (1), a partition (2) and a circular windshield array, wherein the bottom plate of the box body (1) is provided with a first air inlet (11), and the top plate thereof is provided with an air outlet (12); the partition (2) is parallel to the bottom plate and is located in the middle of the box body (1); the circular windshield array is located directly above the first air inlet (11) and directly below the partition (2), and the circular windshield array comprises a plurality of windshields (3), which are parallel to the bottom plate and spaced apart to form the circular windshield array.
2. A heating oven for achieving asphalt oxidation according to claim 1, characterized in that: The longitudinal section of the windshield (3) is rectangular or trapezoidal.
3. A heating oven for achieving asphalt oxidation according to claim 2, characterized in that: When the longitudinal section of the windshield (3) is trapezoidal, the upper bottom surface of the trapezoidal section is located on a side close to the bottom plate.
4. A heating oven for achieving asphalt oxidation according to claim 1, characterized in that: The windshield (3) is a curved panel, and the outer convex surface of the curved panel is arranged opposite to the bottom plate of the box body (1).
5. A heating oven for achieving asphalt oxidation according to claim 1, characterized in that: The number of the first air inlet holes (11) and the number of the wind shield plates (3) are the same and correspond one to one.
6. A heating oven for achieving asphalt oxidation according to claim 1, characterized in that: The windshield (3) is provided with a supporting foot (31), and the supporting foot (31) is fixed to the bottom plate of the box body (1).
7. A heating oven for achieving asphalt oxidation according to claim 1, characterized in that: A second air inlet (13) is provided on the side wall of the box body (1), and a three-way valve (14) is provided on the second air inlet (13). The two air inlets of the three-way valve (14) are respectively connected to an air source and a nitrogen source.
8. A heating oven for achieving asphalt oxidation according to claim 7, characterized in that: The second air inlet (13) is located below the wind shield (3).
9. A heating oven for achieving asphalt oxidation according to claim 1, characterized in that: The first air inlet (11) is connected to an air compressor (4), and the air inlet end of the air compressor (4) is connected to an air heating device (5).
10. A heating oven for achieving asphalt oxidation according to any one of claims 1 to 9, characterized in that: The material of the windshield (3) is ceramic.